[GHC] #11390: GHC does not warn about redundant patterns

[GHC]

#11390: GHC does not warn about redundant patterns
-------------------------------------+-------------------------------------
        Reporter:  Iceland_jack      |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.1
      Resolution:                    |             Keywords:  warnings,
                                     |  PatternMatchWarnings
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
-------------------------------------+-------------------------------------

Comment (by rwbarton):

 Good point. If the return type was a type with values, the clause would
 ''really'' not be redundant!
 {{{
 sillyFun :: F1 Char -> String
 sillyFun x = "hi"
 }}}
 Surely it doesn't make sense for redundancy of a pattern match to depend
 on what sort of thing is on the right hand side?

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11390#comment:11>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler